Creed is known for having an ambergris note in many, if not most, of their scents. It is a distinctive scent. Of course the quality of the ambergris has a lot to do with how it smells. It's been described as sweet, salty, smelling of vomit or bile, animalic, and it sometimes is also referred to as somewhat fecal. It's used as a fixative in fragrances and is used to tie many of the notes in a fragrance together. At the same time those other notes also help to round out the sharp odor of the ambergris.
If you've ever tested a few Creed scents you'll come across the note and it's easily detectable (to my nose at least) from one frag to the next. It's just a familiar note in their scents. I'm sure it's probably a mixture of natural amergris and high quality synthetic. The note is not very pronounced but it is detectable and once you find it you will always pick it up.
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